Logical Maths # 1

1. Solve the following problems

1.

if
1*2*3=7
2*3*4=14
3*4*5=23
then  4*5*6=?

2.

If
2*3 = 36
3*5 = 225
4*5 = 400, 
then 3*6 =?

3. if

11 + 11 = 4

12 + 12 = 9

13 + 13 = ?

4. if

2 + 2 = 6

3 + 3 = 11

7 + 7 =  51

Then  5 + 5 =?

5. If
4 + 5 = 20
3 + 7 = 84
2 + 4 = 16
5 + 6 = 30
5 + 9 = ?